it's not known if the gunman in newtown, connecticut suffered from mental illness. but the man who shot four firefighters in webster new york this week-- killing two ofhem who were remembered at a procession yesterday-- left a disturbing note in which he pledged to burn down the neighborhood and quote "do what i like doing best, killing people." politicians and commentators have used these and prior attacks to call for improved mental health screening and treatment. but one such program in california has proven hard to implement, as newshour correspondent spencer michels reports. >> i wanted the world to know what a wonderful, incredible person she was. >> reporter: for more than a decade, nick and amanda wilcox have been advocating timely treatment and early intervention for the severely mentally ill in the hopes they won't become violent. twelve years ago, their 19-year old-daughter laura wilcox, a college sophomore, was murdered by while she was working over christmas break at a mental health clinic in nevada county, california. >> at about 11:30 a client at the